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(2/3)*x-9 = (1/2)*x // - (1/2)*x
(2/3)*x-((1/2)*x)-9 = 0
(2/3)*x+(-1/2)*x-9 = 0
1/6*x-9 = 0 // + 9
1/6*x = 9 // : 1/6
x = 9/1/6
x = 54
x = 54
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